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First of all, availability varies by age. You'd have to get a standard age distribution for the U.S. population by age -- not that hard to get -- and base your calculations on that, by decade. Certainly, the prospects are better in the 20s, when more of a particular generation is alive and also single, than in the 40s or certainly the 60s. I suspect that in the 20s, many fewer than 50 percent of everyone is married -- certainly under 25.
As for hair color, I've found relatively few people who fixated on it much; and besides, there's Lady Clairol. So I think this metric is overweighted.
Socioeconomic status is also overrated in your system. You may not find supermodels dating package boys, but you may well find executives dating (maybe not too seriously) secretaries and waitresses. Here's a clue -- women don't want to marry men who are beneath them socioeconomically, but a lot of men don't mind at all -- especially when their idea of a relationship is a free servant with sex.
Frankly, the biggest issue for dating is the balance or imbalance between men and women in the active dating groups. I've been told that in NY there are more eligible women than men, but out in the SF Bay Area, there are many more eligible -- nay, desperate -- men than women. NY attracts a lot of young and youngish career women, the SF Bay Area attracts a lot more nerds.
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